Physics 9702/12 May/June 2023: question paper and mark scheme

Question

A stone sinks in water. What is a possible value for the density of the stone? A 8 × 102 kg m–3 B 2 × 103 kg m–3 C 8 × 103 N m–3 D 2 × 104 N m–3

Question

Gm, Tm, μm and pm are all units of length. Which unit is the largest and which unit is the smallest? largest smallest unit unit A Gm μm B Gm pm C Tm μm D Tm pm

Question

Two measurements for a solid sphere are shown. mass = (32.5 ± 0.1) g diameter = (1.87 ± 0.04) cm These values are used to determine the density of the sphere. What is the percentage uncertainty in the density? A 2.4% B 4.6% C 6.1% D 6.7%

Question

An aircraft travels along a horizontal path. Two of the forces that act horizontally on the aircraft are the thrust force of the engines and the force due to the wind. The vector diagram for these forces is shown. force due to the wind thrust force of the engines Which vector represents the resultant horizontal force acting on the aircraft due to these two forces? A B C D

Question

A ball travels from point X to point Y around a semicircular track of radius 1.0 m, as shown. X north ball west east south 1.0 m Y What is the displacement of the ball from X to Y? A 2.0 m B 2.0 m due south C 3.1 m D 3.1 m due south

Question

A rock is launched vertically upwards from the surface of the Earth and an identical rock is launched vertically upwards from the surface of Mars. Each rock is launched with an initial velocity of 12 m s–1. Each rock then reaches its maximum height above the surface before returning back down to the surface. The velocity–time graph for each rock is shown. In both cases, air resistance is negligible. 15 velocity / m s–1 10 5 0 time / s 0 2.0 4.0 6.0 8.0 –5 Earth Mars –10 –15 What is the difference in the maximum heights of the two rocks? A 12 m B 15 m C 19 m D 24 m

Question

Which statement describes the mass of an object? A the force the object experiences due to gravity B the momentum of the object before a collision C the resistance of the object to changes in motion D the weight of the object as measured by a balance

Question

A submarine of total mass 3200 kg is at rest underwater. water surface submarine at rest sea bed The total mass of the submarine is suddenly decreased by 200 kg by pumping water out of the submarine horizontally in a negligible time. The upthrust acting on the submarine is unchanged. The change in the total weight of the submarine causes it to accelerate vertically upwards. What is the initial upwards acceleration of the submarine? A 0.613 m s–2 B 0.654 m s–2 C 9.81 m s–2 D 10.5 m s–2

Question

A box in air slides with increasing speed down a rough slope from point P to point Q. P box Q The slope surface exerts a constant frictional force on the box. As the box moves from P to Q, there are changes to the magnitudes of its acceleration and the total resistive force acting on it. Which row describes the changes? magnitude of magnitude of total resistive acceleration force A increases decreases B decreases decreases C increases increases D decreases increases

Question

Two balls, X and Y, approach each other along the same straight line and collide. The collision is perfectly elastic. Their initial speeds are uX and uY respectively. After the collision they move apart with speeds vX and vY respectively. Their directions are shown. uX uY before X Y vX vY after X Y Which equation is correct? A uX + uY = vX + vY B uX + uY = vX – vY C uX – uY = vX + vY D uX – uY = vX – vY

Question

A rod is pivoted at point O. A force F is applied to the rod at point W, as shown. F X rod W O Y What is the moment of the force F about O? A F × distance OX B F × distance OY C F × distance WO D F × distance WX

Question

A uniform rod XY of weight 10.0 N is freely hinged to a wall at X. It is held horizontal by a force F acting from Y at an angle of 30° to the horizontal, as shown. F wall 60q 30q X Y 10.0 N What is the value of F ? A 5.0 N B 8.7 N C 10 N D 20 N

Question

Two solid cubes X and Y are made of material of the same density. Cube X has twice the mass of cube Y. Cube X has sides of length x. Cube Y has sides of length y. x What is the ratio ? y A 1.26 B 1.41 C 2.00 D 8.00

Question

A U-shaped glass tube contains liquid of density 2000 kg m–3, as shown. tube P liquid, density 2000 kg m–3 Q 10.0 cm 6.0 cm What is the difference in pressure due to the liquid between levels P and Q? A 780 Pa B 1200 Pa C 1600 Pa D 2000 Pa

Question

A steam turbine is used to drive a generator. The input power to the turbine is PI and the output power is PO. The power loss in the turbine is PL, as shown. input power PI output power PO turbine generator power loss PL What is the efficiency of the turbine? PL PI PL PO A B C D PO PO PI PI

Question

A variable force is applied to ensure that a constant power is supplied to a train. Which graph best shows the variation of the force F applied with the velocity v of the train? A B C D F F F F 0 0 0 0 0 v 0 v 0 v 0 v

Question

A block is released from rest and slides a distance x down a straight slope. The slope is at an angle θ to the horizontal. block slope x T The slope is frictionless and air resistance is negligible. The acceleration of free fall is g. Which expression gives the final speed of the block? gx sin θ A B 2gx sin θ C 2gx D 2gx sin θ 2

Question

What is meant by the spring constant of a spring? A extension per unit force 2 × force × extension 1 B C force × extension D force per unit extension

Question

A child holds a thin metal wire that is attached to a kite. The graph shows how the extension of the wire varies with its tension. 150 tension / N wire kite 100 50 0 0 0.15 0.30 0.45 extension / mm A gust of wind increases the tension from 100 N to 150 N. What is the change in the elastic potential energy of the wire caused by the gust of wind? A 3.8 mJ B 19 mJ C 34 mJ D 38 mJ

Question

A microphone detects a sound wave. The microphone is connected to a cathode-ray oscilloscope (CRO). The shape of the trace on the screen of the CRO is shown. Which property of the sound wave can be determined by using only the measurement of a horizontal distance on the screen and the value of a control setting of the CRO? A amplitude B frequency C speed D wavelength

Question

A longitudinal wave is travelling from left to right. The graph shows the variation of the displacement of the particles with distance along the wave at one instant in time. Displacements to the right are positive; displacements to the left are negative. Which labelled point represents a compression? A displacement B D 0 0 distance C

Question

A source X emits a sound wave of constant frequency f. The wave is subsequently received at a stationary detector Y. The frequency of the wave that is detected by Y is less than f. What could be the reason for this? A Between X and Y, the wave undergoes diffraction. B Between X and Y, the wave undergoes reflection. C X is moving away from Y. D X is moving towards Y.

Question

A beam of visible light is in a vacuum. What could be the frequency of the light? A 5.0 × 105 Hz B 5.0 × 108 Hz C 5.0 × 1011 Hz D 5.0 × 1014 Hz

Question

A vertically polarised beam of light of intensity I0 is incident normally on a polarising filter. The transmission axis of the filter is at 45° to the vertical. The beam of light transmitted by this filter is then incident normally on a second filter. The transmission axis of the second filter is horizontal. transmission axis vertically 45q of second filter polarised I0 light transmission axis of first filter What is the intensity of the beam of light after transmission through the second filter? 4 I0 2 I0 I0 1 1 A 0 B C D

Question

A stationary wave is formed by two progressive waves travelling in opposite directions along the same line of travel. Which statement about the two progressive waves is not correct? A They must have a constant phase difference. B They must have the same frequency. C They must have the same wavelength. D They must travel at the same speed.

Question

The sound from a loudspeaker placed above a tube causes resonance of the air in the tube. A stationary wave is formed with two nodes and two antinodes, as shown. loudspeaker 60 cm The tube has height 60 cm. The speed of sound in the air is 340 m s–1. What is the frequency of the sound? A 430 Hz B 570 Hz C 850 Hz D 1700 Hz

Question

A continuous progressive water wave in a ripple tank passes through a gap in a barrier and diffracts. The width of the gap is greater than the wavelength of the wave. Which change causes the wave to spread over a larger angle as it passes through the gap? A a small decrease in the wavelength of the wave B a small decrease in the width of the gap C a small increase in the frequency of the wave D a small increase in the height of the barrier

Question

The diagram shows a view from above of a double-slit interference demonstration. L is a monochromatic light source with a vertical filament. B is a barrier with two narrow vertical slits and S is a screen upon which interference fringes form. NOT TO SCALE L B S The intensity is I at the point on the screen where the centre of the fringe pattern forms. When one of the slits is covered, what is the intensity at the same point on the screen? A I B I C I D I 2 2 2 2 4

Question

Green light of wavelength 550 nm is incident normally on a diffraction grating and produces a diffraction pattern on a screen placed 3.5 m from the diffraction grating. The third-order maximum on the screen is a distance of 0.75 m from the zeroth-order (central) maximum. screen NOT TO SCALE zeroth-order 3.5 m (central) maximum green light 0.75 m diffraction grating third-order maximum What is the distance between two adjacent slits in the diffraction grating? A 2.6 × 10–6 m B 7.7 × 10–6 m C 7.9 × 10–6 m D 1.0 × 10–5 m

Question

Which charge can be carried by a charge carrier? A 1.1 × 10–19 C B 4.0 × 10–19 C C 4.8 × 10–19 C D 9.1 × 10–19 C

Question

A resistor of resistance R is connected across a cell of electromotive force (e.m.f.) E and negligible internal resistance. Which single change to the circuit would lead to the largest increase in the power dissipated in the resistor? A doubling the value of E B doubling the value of R C halving the value of E D halving the value of R

Question

An electrical cable is made up of one thick strand of copper wire that is surrounded by eight thin strands of copper wire. All nine strands of wire are connected in parallel with each other. A cross-section of the cable is shown. thick strand, cross-sectional thin strand, area 4A cross-sectional area A Each thin strand of wire has cross-sectional area A and length L. The thick strand of wire has cross-sectional area 4A and length L. The cable has total resistance R. Which expression gives the resistivity of copper? 4A 12 A 4 AR 12 AR A B C D 33RL RL L L

Question

A car has sensors for detecting the light intensity and temperature of its environment. The sensors make use of a light-dependent resistor (LDR) and a thermistor. The car moves from a warm and dark environment into a cold and bright environment. What are the changes to the resistances of the LDR and thermistor? resistance resistance of of LDR thermistor A increases increases B increases decreases C decreases increases D decreases decreases

Question

A student assembles the circuit shown. lamp 1 lamp 2 Which row describes the state of the two lamps? lamp 1 lamp 2 A off off B on off C off on D on on

Question

Kirchhoff’s first law is a consequence of the conservation of which quantity? A charge B energy C momentum D potential difference

Question

Three identical cells each have electromotive force (e.m.f.) E and negligible internal resistance. The cells are connected to three identical resistors, each of resistance R, as shown. E R E R R E What is the potential difference across one of the resistors? E 2E A 0 B C D E 3 3

Question

In the potentiometer circuit shown, the reading on the ammeter is zero. power supply A sliding contact uniform metal wire The light-dependent resistor (LDR) is then covered and the ammeter gives a non-zero reading. Which change could return the ammeter reading to zero? A decreasing the supply voltage B increasing the supply voltage C moving the sliding contact to the left D moving the sliding contact to the right

Question

What are isotopes? A nuclei of different elements with the same number of neutrons B nuclei of different elements with the same number of nucleons C nuclei of the same element with different numbers of neutrons D nuclei of the same element with different numbers of protons

Question

A neutron 10 n is fired at a 235 92 U nucleus. The neutron is absorbed by the nucleus which then splits to form nuclei of 141 92 56 Ba and 36 Kr. What is the number of free neutrons emitted when the 235 92 U nucleus splits? A 0 B 1 C 2 D 3

Question

A π+ meson has a charge of +e, where e is the elementary charge. It consists of an up quark and one other quark. What could be the other quark in the π+ meson? A anti-down B anti-up C bottom D charm